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welcome back. what has been done recently? when did this problem start?to me i would try and bleed the system and see what happens. im going to attach a few links to see if they help. if it doesnt help i would think a faulty master cylinder, but how are your brakes?Brake System and DiagnosisBleeding the power steering system
If neither the steering nor the brakes have power assist, and you have already covered the basics previously outlined, check for restricted hoses between the pump, booster and steering gear, then check the pump.IIRC, the autopark brake is controlled via the neutral safety switch and a logic module. Is this in an RV?